Why is desorption important for a substance to act as good catalyst?

Explanation

**Step-by-Step Solution:**

1. **Understanding Catalysis**: A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It provides an alternative pathway for the reaction with a lower activation energy.

2. **Role of Adsorption**: In catalysis, reactant molecules are first adsorbed onto the surface of the catalyst. This adsorption is crucial as it brings the reactants into close proximity, facilitating the reaction.

3. **Completion of Reaction**: Once the reactants are adsorbed, they undergo a chemical reaction on the catalyst's surface. This step is essential for the transformation of reactants into products.

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